Paul Rogers commented on DRILL-6152:

Only for multi-line quoted processing. Single-line quotes are fine with splits.

Originally Drill did not support multi-line comments. I think I "fixed" that in 
response to a bug, but I later realized that the result is not splittable.

> For CSV and TSV files splitting should be disabled in case of quoted 
> processing
> -------------------------------------------------------------------------------
>                 Key: DRILL-6152
>                 URL: https://issues.apache.org/jira/browse/DRILL-6152
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Vlad Rozov
>            Priority: Major
> With quoted processing enabled it is not possible to process csv or tsv file 
> from an arbitrary offset. Consider a case where a csv file is split inside a 
> quoted string that contains a line feed. As beginning quote is part of 
> another split, line feed would be recognized as a regular line feed instead 
> of a line feed inside quotes. 

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